stehle



(No Model.) 2 Sheets-Sheet 1. A STEELE ADJUSTABLE ASSORTING SCREEN.

No. 436,615. Patented Sept. 16, 1890.

(No Model.) 2 Sheets-Sheet 2.

A. STEELE. ADJUSTABLE ASSORTING SCREEN. 110.436,615. Patented Sept. 16,1890.

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,y UNITED 'STATES PATENTy OFFICE.

ANTON STEHLE, OF OANNSTADT, GERMANY.

ADJUSTABLE ASSORTINGf-SCREEN.

`S51-2EGIIEICA'LION forming part 0f Letters Patent No. 436,615, datedSeptember 16, 1890.

Application filed March 29, 1890. Serial No. 345,926. (No model.)

To all whom t may concern:

Beit known that I, ANTON STEHLE, a subject of the King of "Wrtemberg,residing at Cannstadt, Wrtemberg, Germany, have invented a new anduseful Improvement in Adj ustable Assorting-Screens, of which thefollowing is a specification.

This invention relates to flat screens having parallel wires extendinglongitudinally of the screen, a portion of which are attached atequidistant points to transverse bars secured to the screenframe, whileanother group of wires interposed between the former is also attached totransverse bars,which, by a peculiar arrangement, hereinafter to bedescribed, may be raised or lowered at pleasure, so that the intervalsbetween the wires of the screen may be adjusted and raised betweencertain limits, all the intervals being equal for any one position ofthe wires.

In the accompanying drawings, Figures l, 2, and 4 represent,respectively, a plan, a side elevation, and a transverse verticalsection of an adjustable screen embodying my invention; and Figs. 3, 5,6, and 7, detail views, on an enlarged scale, of the mechanism forraisingr and lowering the wires.

In the drawings l have shown round wires; but obviously rectangularwires or wires of any desired cross-section may be employed. Ihaveherein shown the first, iifth, ninth, dto., wires d4 as attached tothe transverse rods lor barsD4, whichinturn are secured to thescreenframe S, while the intermediate sereenwiresto wit, the second,sixth, tenth, oto., wires (12d are attached to the upwardly-movabletransverse bars D2, the third, seventh, eleventh, dac., wires d2 to thedownwardly movable transverse bars D2, and the fourth, eighteenth,twelfth, (Sz-c., wires d to the upwardlyn movable transverse rod D.

The arrangement for lifting the transverse rods D and D2 is such thatthe saine are lifted to the same extent to a certain height, while thetransverse carriers D2, with their wires d2, do not change theirposition at the start. When the two wires d and cl2 have been raised sothat their mean distance from d2 and Z4 is equal to that between d2 andd4, and it is desired to obtain still greater intervals between thewires, the wires d and cl2 must not only be farther raised, but thewires d3, together with the transverse bars D2, must be lowered ordepressed. The actual sorting or separation is now performed only by thewires d2 and di, while the wires d" and d2 are lifted to such an extentas to permit the free passage of the mixture to be separated to thelower screen wires. For this purpose the screen-wire d should be raisedparticularly high. The following arrangement serves to attain all theseends: Of the superimposed transverse bars D D2 D3 D4, carrying the wiresd', d2, d2, and d, the bars D D2 D2 are bolted to the carriers A', A2,and A2 at both ends, so that by raising or lowering these carriers thescreen-wires are also raised or lowered. To prevent any lateralshifting'of these carriers they run in guide-grooves S, formed in thefour corners of the screen. `The bars D D2 D2, with the wires CZ d2 d3,and the brackets A A2 A3 constitute together the movable screen-frames.

The raising and lowering of the carriers A',

A2, and A3 is effected by the instrumentali-vv ties shown in detail inFigs. 3,' 5, 6, and 7.

The screen-frame S dependsfrom the two supportingshafts T of the screenby means of the supports or hangers Z. Four cams and disks E are alsomounted on the same.` These cam-disks E are provided on one side withso-called lifting-bosses c for elevating the carriers of the transversebars A2, while on the other side are located two diametricallydisposedpins carrying rollers fr' and r3, designed to lift A and lower A2.

The lifting-boss e of the cam-disk E, when the latter is rotated,impinges against the lower face of a lug on the lifting-bracket a2,attached to the carrier A2 of the transverse bars, lifting the latter,and with it the parts A2, the carrier A', which rests freely on thecarrier A2, being coincidently lifted. As soon as a certain height hasbeen attained the point of the boss e rides under-'a curved extension ofthe lug extending from CL2, whereby no further rise of A2 is producedupon the further rotation of the cam-disk E. However,

the rollers r and 'r3 of the cam-disk E now l IOO while the roller r3presses down upon the depressing-piece on the carrier A3, whereby thelatter is lowered. l

'Ihe carrier A is maintained in its normal position by the two springs PP, while the carriers A and A2 are returned thereto by their own weightand that of their appendages.

In order to insure a perfectly uniform raising and lowering of thescreen-wires d d2 cl3, the four similar cam-disks E occupy exactly thesame position on the supporting-shafts T, and their adjustment iscarried out by two levers K, connected by rods t. In order to securethese two levers K in a determined position, I provide an arc-shapedbracket B for one of these two levers, the said lever being retained inany position by a pin s, inserted into one of the holes in the bracketB.

In order to facilitate the lifting of the carriers for the transversebars, together with said transverse bars and screen-Wires, whichrepresent a considerable Weight in the larger sizes of screens, ahorizontal lever II, provided at its end with a counter-weight G, (Whosesize is adapted to the circumstances of the case,) is attached to one ofthe axles T. This adjustable asserting-screen works as follows: Themixture to be assorted is poured in uniform thickness upon the sievewhile the same is agitated, all of the screen-wires d d2 cl3 d occupyingthe same plane, and the spaces between the Wires being consequently ataminimum. A particular dumping device is employed for this purpose. Thesmallest particles now pass through the screen, and after the same havebeen collected in a receptacle the screen-wires d to cl3are raised orlowered at stated intervals by means of the levers K, together -with theother described devices. The interstices of 'the screen are therebychanged and enlarged step by step until the coarsest part of the mixturehas passed through. The levers K are thereupon returned to their initialposition, so that t-he smallest spaces are restored. A new supply of themixture is then poured on and the as` means for moving a portion of themovable screen-frames upward and another portion doWnWard,-substantiallyas and for the purposes set forth.

2. In an adjustable assorting-screen, the combination of a stationaryscreen-frame and a movable screen-frame havingabracket extendingtherefrom with a cam-disk for acting upon the bracket to elevate themovable screen-frame, all substantially as described.

3. In an adjustable assorting-screen, a fixed screen-frame and a seriesof vertically-movable screen frames provided with brackets and a springinterposed between one of the movable frames and the fixed frame, incombination with a cam-disk provided with rollers r r2, allsubstantially as described.

4. In an adjustable assorting-screen, the combination of a fixedscreen-frame and a series of movable screen-frames havingupwardly-extending brackets, one of the brackets being provided withalughaving a curved extension, with a cam disk provided with rollers, as rr3, all substantially as described.

5. In an adjustable assorting-screen, the

combination of the following parts: a fixed' screen-frame provided witha hanger, a shaft or axle from which it is suspended, a series ofmovablescreens provided with brackets, a cam-disk having moving devicesfor engaging the brackets of the movable screen-frames, and a leverattached to the shaft or axle for turning the same and the cam-disk, allsubstantially as set forth.

6. In an adjustable assortingscreen, the

combination of the following parts: a fixedI screen-frame provided withahanger, an axle from which it is suspended, a series of movable screensprovided with brackets, a camdisk having moving devices for engaging-thebrackets of the movable screens, and a lever attached to the axle forturning the same, and the cam-disk and a retaining-bracket for holdingthe lever in its various positions of adjustment, all substantially asdescribed.

7. In an adjustable asserting-screen, the combination of the following`parts: a fixed screenframe, two shafts from which the same aresuspended, a series of movable screenframes having brackets, cam-disksattached to the shafts and having moving devices for engaging thebrackets, and two levers also attached to the shafts and connected bylinks, all substantially as set forth.

8. In an adjustable assortng-screen, the combination of the followingparts: a iixed screen-frame, two shafts from which they are suspended, aseries of movable screen-frames having brackets, cam-disks attached tothe shafts and having moving devices for engaging the said brackets, twolevers also attached to the shafts and connected by links, and aweighted lever attached to one of the shafts, all substantially as setforth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ANTON STEHLE. Witnesses:

ROBERT ALEX; WALTER, AUGUST DRANTZ.

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